1. Institute of Clinical Physiology, National Research Council, Pisa, Italy
2. Department of Anaesthesia and Critical Care', Harefield Hospital, Royal Brompton and Harefield NHS Foundation Trust, London, UK
3. Emergency Medicine, San Luigi Gonzaga University Hospital, Turin, Italy
4. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine, University of Pisa, Italy
5. Anaesthesia and Intensive Care Unit, E.O. Ospedali Galliera, Via Mura delle Cappuccine 14, Genova, Italy
6. Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Siena, Italy